:root {
  --bg0: #fbfbff;
  --bg1: #f3f6ff;
  --text: #111428;
  --muted: rgba(17, 20, 40, 0.62);
  --border: rgba(17, 20, 40, 0.14);
  --glass: rgba(255, 255, 255, 0.55);
  --glass2: rgba(255, 255, 255, 0.40);
  --accent: #6a7dff;
  --accent2: #ff7ad9;
  --shadow: 0 18px 55px rgba(28, 35, 90, 0.14);
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Apple Color Emoji",
    "Segoe UI Emoji";
  color: var(--text);
  background:
    radial-gradient(900px 520px at 15% 10%, rgba(106, 125, 255, 0.22), rgba(106, 125, 255, 0.0) 55%),
    radial-gradient(900px 520px at 75% 0%, rgba(255, 122, 217, 0.18), rgba(255, 122, 217, 0.0) 60%),
    radial-gradient(1100px 680px at 50% 95%, rgba(110, 255, 229, 0.16), rgba(110, 255, 229, 0.0) 55%),
    linear-gradient(180deg, var(--bg0), var(--bg1));
}

.wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 26px 18px 22px;
  min-height: 100vh;
  position: relative;
  z-index: 1;
}

.top h1 {
  margin: 0;
  letter-spacing: 0.4px;
  font-weight: 800;
  text-shadow: 0 10px 40px rgba(28, 35, 90, 0.10);
}

.sub {
  margin: 6px 0 0;
  color: var(--muted);
}

.panel {
  margin-top: 16px;
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 16px;
  align-items: start;
}

.controls {
  background: linear-gradient(180deg, var(--glass), var(--glass2));
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-radius: 14px;
  padding: 14px;
  display: grid;
  gap: 12px;
}

.file, .row {
  display: grid;
  gap: 6px;
}

label span {
  font-size: 12px;
  color: var(--muted);
}

input[type="file"], select {
  width: 100%;
  padding: 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.65);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--text);
}

.row {
  grid-template-columns: 120px 1fr 48px;
  align-items: center;
}

input[type="range"] {
  width: 100%;
}

output {
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  text-align: right;
}

.buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

button {
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.75),
    rgba(255, 255, 255, 0.45)
  );
  color: var(--text);
  cursor: pointer;
  box-shadow: 0 10px 28px rgba(28, 35, 90, 0.12);
  position: relative;
  overflow: hidden;
}

button::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(380px 120px at 20% 0%, rgba(255, 255, 255, 0.85), rgba(255, 255, 255, 0) 60%);
  opacity: 0.55;
  pointer-events: none;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

button:hover:not(:disabled) {
  border-color: rgba(106, 125, 255, 0.45);
  box-shadow: 0 14px 34px rgba(28, 35, 90, 0.16);
  transform: translateY(-1px);
}

button:active:not(:disabled) {
  transform: translateY(0px);
}

.help {
  color: var(--muted);
}

.help summary {
  cursor: pointer;
}

.preview {
  background: linear-gradient(180deg, var(--glass), var(--glass2));
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-radius: 14px;
  padding: 14px;
  display: grid;
  gap: 10px;
}

.canvasWrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  border-radius: 12px;
  border: 1px solid rgba(17, 20, 40, 0.14);
  overflow: hidden;
  background:
    radial-gradient(900px 560px at 10% 15%, rgba(106, 125, 255, 0.16), rgba(106, 125, 255, 0) 60%),
    radial-gradient(900px 560px at 85% 0%, rgba(255, 122, 217, 0.12), rgba(255, 122, 217, 0) 55%),
    rgba(255, 255, 255, 0.40);
}

canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.status {
  position: absolute;
  left: 10px;
  bottom: 10px;
  padding: 6px 10px;
  border-radius: 10px;
  font-size: 12px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.70);
  border: 1px solid rgba(17, 20, 40, 0.14);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.hint {
  color: var(--muted);
  font-size: 12px;
}

code {
  color: rgba(17, 20, 40, 0.8);
  background: rgba(255, 255, 255, 0.65);
  border: 1px solid rgba(17, 20, 40, 0.10);
  padding: 2px 6px;
  border-radius: 8px;
}

.footer {
  margin-top: 14px;
  color: var(--muted);
  font-size: 12px;
}

@media (max-width: 960px) {
  .panel {
    grid-template-columns: 1fr;
  }
}